Ответ:
{х+2у=1
+
{-х+2у=3
_______
4у=4
у=1
х+2*1=1
х=1-2
х=-1
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Ответ:
{х+2у=1
+
{-х+2у=3
_______
4у=4
у=1
х+2*1=1
х=1-2
х=-1